How Does Torque Relate to Heat Engines and the Second Law of Thermodynamics?

AI Thread Summary
The discussion focuses on understanding the relationship between torque, heat engines, and the Second Law of Thermodynamics, specifically in the context of a multicylinder gasoline engine. The engine operates at 2500 rev/min, consuming energy and exhausting a significant amount per crankshaft revolution. Key calculations involve determining fuel consumption, mechanical power output, torque exerted by the crankshaft, and the power required for the exhaust and cooling systems. The original poster initially sought help for the calculations related to torque and power transfer but later indicated they figured it out independently. The conversation highlights the interplay between thermodynamic principles and engine performance metrics.
bruisika
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we are learning about heat engines and the 2nd law of thermodynamics...and i don't know how to relate torque to these concepts...
the question is...
a multicylinder gasoline engine in an airplane, operating at 2500rev/min, takes in energy at 7.89E3 J and exhausts 4.58E3 J for each revolution of the crankshaft.
a) how many liters of fuel does it consume in 1 hr of operation if the heat of combustion is 4.03E7 J/L
b) what is the mechanical power output of the engine? ignore friction and express the answer in horsepower
c) what is the torque exerted by the crankshaft on the load
d) what power must the exhaust and cooling system transfer out of the engine?

i know how to do A and B, but i don't know where to start for C and D... can anyone help? THanks
Jenna
 
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figured it out

just kidding i figured it out..
 
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